Building structure



FIG. 1 is a perspective view showing the front and right side of my design for a building structure; and

FIG. 2 is an elevational view of a side of my building structure looking from the left of FIG. 1; and

FIG. 3 is an elevational view of a side of my building structure looking from the right of FIG. 1; and

FIG. 4 is an elevational view of the back of my building structure; and

FIG. 5 is a top plan view of the building structure; and

FIG. 6 is a front elevational view of my building structure. 

The ornamental design for a building structure, as shown. 